[tip:x86/asm 3/3] bug.c:undefined reference to `__start___bug_table'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/asm
head:   19d436268dde95389c616bb3819da73f0a8b28a8
commit: 19d436268dde95389c616bb3819da73f0a8b28a8 [3/3] debug: Add _ONCE() logic to report_bug()
config: c6x-evmc6678_defconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 19d436268dde95389c616bb3819da73f0a8b28a8
        # save the attached .config to linux build tree
        make.cross ARCH=c6x 

All errors (new ones prefixed by >>):

   lib/lib.a(bug.o): In function `find_bug':
>> bug.c:(.text+0x114): undefined reference to `__start___bug_table'
>> bug.c:(.text+0x118): undefined reference to `__stop___bug_table'
   bug.c:(.text+0x11c): undefined reference to `__start___bug_table'
   bug.c:(.text+0x120): undefined reference to `__stop___bug_table'

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